Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title New LED Current Balancing Scheme Using C-Fed Z-Source Converter
Authors Daheon Hong ; Honnyong Cha
DOI 10.6113/TKPE.2021.26.1.9
Page pp.9-15
ISSN 1229-2214
Keywords Charge balance condition; Current-fed; LED current balancing; Z-source network
Abstract In multi-string light-emitting diode (LED) driver system, current balancing is crucial because the brightness of LED is directly related to its forward current. This paper presents a novel LED current balancing topology using current-fed Z-source converter. With the proposed structure, currents flowing through two LED strings are automatically balanced owing to the charge-balance condition on capacitors. Operation of the proposed converter is simple and the proposed converter uses only one active switch and one diode. Moreover, low-side gate driving can be used to operate the active switch. To verify the operation of the proposed LED current balancing converter, a prototype is built and tested with different numbers of LEDs.